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강상관계 물질 연구단
강상관계 물질 연구단
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Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission

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Title
Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission
Author(s)
Soobin Sinn; Kyung Dong Lee; Choong Jae Won; Ji Seop Oh; Moonsup Han; Young Jun Chang; Namjung Hur; Byeong-Gyu Park; Changyoung Kim; Hyeong-Do Kim; Tae Won Noh
Publication Date
2017-07
Journal
SCIENTIFIC REPORTS, v.7, no., pp.4528 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Ag5Pb2O6 has attracted attentions due to its novel nearly-free-electron superconductivity, but its electronic structure and orbital character of the Cooper-pair electrons remain controversial. Here, we present a method utilizing core-level photoemission to show that Pb 6s electrons dominate near the Fermi level. We observe a strongly asymmetric Pb 4 f7/2 core-level spectrum, while a Ag 3d5/2 spectrum is well explained by two symmetric peaks. The asymmetry in the Pb 4 f7/2 spectrum originates from the local attractive interaction between conducting Pb 6s electrons and a Pb 4 f7/2 core hole, which implies a dominant Pb 6s contribution to the metallic conduction. In addition, the observed Pb 4 f7/2 spectrum is not explained by the well-known Doniach-Šunjić lineshape for a simple metal. The spectrum is successfully generated by employing a Pb 6s partial density of states from local density approximation calculations, thus confirming the Pb 6s dominant character and free-electron-like density of states of Ag5Pb2O6. © The Author(s) 2017
URI
http://pr.ibs.re.kr/handle/8788114/4151
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
12_s41598-017-04667-9.pdfDownload

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